linux-kernel - Re: [RFC PATCH 01/15] mm: memcontrol: fix page charging in page replacement

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Message-ID: <YGczMjv3JbXQmzW8@cmpxchg.org>
Date:   Fri, 2 Apr 2021 11:07:30 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     guro@...com, mhocko@...nel.org, akpm@...ux-foundation.org,
        shakeelb@...gle.com, vdavydov.dev@...il.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        duanxiongchun@...edance.com
Subject: Re: [RFC PATCH 01/15] mm: memcontrol: fix page charging in page
 replacement

On Tue, Mar 30, 2021 at 06:15:17PM +0800, Muchun Song wrote:
> The pages aren't accounted at the root level, so do not charge the page
> to the root memcg in page replacement. Although we do not display the
> value (mem_cgroup_usage) so there shouldn't be any actual problem, but
> there is a WARN_ON_ONCE in the page_counter_cancel(). Who knows if it
> will trigger? So it is better to fix it.
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>